Furnace grate-bar and grating



NjPETtRS. PHOTO-LITHOGRAPHER, WASHINGTON. D

UNITED STATES PATENT OEEicE.

JOHN GUTHBERT, OF PITTSBURG, PENNSYLVANIA.

FURNACE GRATE-BAR AND GRATING.

Specification forming pa-rt of Letters Patent No. 102,233, dated April 26, 1870.

To all 'whom 'it may concern Be it known that that I, JOHN GUTHBERT, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Furnace Grate- Bars and Grating; and I do hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawings, making a part of this specification, in which- Figure 1 is a perspective view of my improved grateebar and grating, showing the construction thereof and the arrangement with reference to the furnace bridge-wall. Fig. 2 by a side view illustrates the same, and Fig. 3 illustrates by a perspective view the arrangement of a rear grating and separate gratebar.

Like letters of reference indicate like parts in each.

My invention relates to an improved construction and arrangement of grate-bars and grating for steam-boiler, paddling, and other large furnaces; and it consists in making the bar of an improved form and in combining with it an inclined rear grating, such grating being made separate or cast with the main bar, so as to form a part thereof.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and mode of operation.

The main bar A is cast in any of the ways known to the art, with a series of side ribs, a', projecting from a central web, a, the `upper faces of both being grooved or iiuted to receive and retain a layer of ashes as a protection to the bar against the heat ot' the fire.

In furnace-fires the maximum of-combustion and heat is secured at the rear part and with the ordinary straight-faced bars. The upper faces of such bars at the rear ends are commonly burned away in a short time till the level of such rear faces becomes about an inch (more or less) lower than the front faces, and then the burning-away action of the tire on the grate-bars becomes much less destructive and comparatively ceases. To obviate this defect, and' as animprovementon the ordinary straightfaced bars, I make the bar A with a downward curve, as at ct, about midway between its ends, so that its rear face, s', when in use, shall be a little lower than its front face, s. The bar then burns away more uniformly over the whole of its firesurface with a consequent increase in its durability. This construction also enables me to secure another desirable end-viz., the more perfect combustion of the smoke and gases evolved by the fire. fresh fuel is fed in through the furnace-door on the front or higher face, s, of the bars, and as it becomes ignited it is pushed back onto the rear or lower face, s. I thus secure in the rear of the furnace a thicker bed of burning fuel, and with a greater evolution of heat therefrom secure a more perfect combustion of the smoke, carbon, 85C., which are driven off from the fuel in front and pass back through the smoke-lines. This is especially the case with the soft or bituminous coal used as fuel in many parts of the country.

The better to secure the complete combustion of the smoke, carbon gases, Sto., from the re, I use, in connection with the main bar A, a grating, B, either cast as a part thereof, as in Fig. l, or cast separate, as in Fig. 3, their relation to each other in either case being the same. This grating B B' extends from the rear end of the bar A, with an upward slope to the top of the bridge-wall c, the angle of inclination being greater or less, as may be desired.

As shown in Fig. 1, the number of bars b is such as to give, with the bar A, a continuous bar of a width nearly or exactly uniform.

As shown in Fig. 3, the gratings B are mounted on walls c c', with a groove, e', in the end bar, b', which engages a hook, e, on the end of the bar A. The barsA are then arranged at any desired distance from each other, with their hooks e resting in the groove e to the number required in the furnace.

With the ordinary furnace grating and bridge-wall at the rear end the fuel employed, as it is pushed back, is apt to coke and clinker on thebridge-wall. By myarrangementot inclined rear grating, B or B', extending at any desired angle from the rear end of the main bar A to the top ofthe bridge-wall, I Wholly obviate this objection and increase the heat-producing capacity of the furnace at an inconsiderable expense.

What I claim as my invention, and desire to secure by Letters Patent, is

l, A grate-bar made with a rear surface, s', depressed below or lower than the front surface, s, substantially as described.

2. A grate-bar the main part of which, A,

The

2 weee@ is of the ordinary or any known for1n,zindthe rear end 0f which, B, is inclined backward and upward, so as when in use to rest on zi bridgewall, c, substantially as shown and described with reference to Fig. l.

3. In the construction of furnace-grams, an inclined grating, B', arranged next: the bridgewall at the rear of the nre-chamber, snbstzin` tially :is shown and described with reference to Fig, 3.

In testimony whereof I, the said JOHN CUTH- BERT, have herennto set my hand.

JOHN OUTHBERT. Witnesses:

JOHN GLENN, Tues. W. KERR. 

